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AW: Fail over

Hi Bjorn,

I am not sure that Kristyan is asking about slurpd. Slurpd will update replica, it is not substitution for any sort of clustering or so. If master is not available, you will not be able update replica anyway, which means that you've zero of failover in applications doing lots of updates. The better way to achive his goal would be real multi-master replication, but I am not sure that it works with recent versions of openldap (2.1.*). There were lots of letters around recently about multimaster replication, but up to my best knowledge they were related to 2.0.* versions of openldap. People were suggesting to use --enable-multimaser or #define SLAPD_MULTIMASTER 1 in portable.h. I don't think in 2.1.2 either of them has an effect, in 2.1.4 #define SLAPD_MULTIMASTER is commented, so perhaps, it would make sense to try that multimaster activity with 2.1.4? Well, anyway that's all details. I am reading this maillist during last three month and I have not noticed that multimaster replication is sort of "officially" available feature in openldap, well at least people do not really like to talk about it. In such case it probably would make more sense to dig in direction of conventional clustering.

Regards, Vadim Tarassov. 

-----Ursprüngliche Nachricht-----
Von: Bjørn Ove Grøtan [mailto:bjorn.grotan@itea.ntnu.no]
Gesendet: Mittwoch, 11. September 2002 14:14
An: Kristyan Osborne
Cc: OpenLDAP (E-mail)
Betreff: Re: Fail over

Kristyan Osborne:
> Hi,
> I'm quite new to openldap so you will have to excuse any stupid questions from me.
> I want to make my ldap server redundant so that if it fails another one could take over with no or very little down time.
> Could someone explain to me how to do this or point me to some documentation.

Browse the list archives for "multi-master" and you can catch the documentation
on Slurpd.


Bjørn Ove Grøtan